Free translatorFree translator
Synonyms, antonyms, pronunciation

  Home
English Dictionary      examples: 'day', 'get rid of', 'New York Bay'




Tunicata   Listen
proper noun
Tunicata  n.  (Zool.) A grand division of the animal kingdom, intermediate, in some respects, between the invertebrates and vertebrates, and in modern classifications considered a subphylum of the vertebrates; called also urochordata. They were formerly classed with acephalous mollusks. The body is usually covered with a firm external tunic, consisting in part of cellulose, and having two openings, one for the entrance and one for the exit of water. The pharynx is usually dilated in the form of a sac, pierced by several series of ciliated slits, and serves as a gill. Note: Most of the species when mature are firmly attached to foreign substances, but have free-swimming larvae which are furnished with an elongated tail and somewhat resemble a tadpole. In this state the larva has a urochord and certain other structures resembling some embryonic vertebrates.






Collaborative International Dictionary of English 0.48








Advanced search
     Find words:
Starting with
Ending with
Containing
Matching a pattern  

Synonyms
Antonyms
Quotes
Words linked to  

only single words



Share |





"Tunicata" Quotes from Famous Books



... of those who witnessed it, though groundless and absurd theories were current. Of the creature discovered and described by Peron, Phipson says that it is "one of the most curious of animals. It belongs to the tribe of Tunicata. Each individual resembles a minute cylinder of glowing phosphorus. Sometimes they are seen adhering together in such prodigious numbers that the ocean appears as if covered with an enormous mass ...
— Terre Napoleon - A history of French explorations and projects in Australia • Ernest Scott

... The Tunicata, or sea squirts, are animals which have become simple through degeneration, due to the adoption of a sedentary life, the withdrawal from the crowd of animals and from the struggle which it necessitates. The young tunicate is a free-swimming, active, tadpolelike, or fishlike ...
— Composition-Rhetoric • Stratton D. Brooks

... because the model, whence they derive their union, is one of nature's planning. My lord, have you ever observed the mysterious federation subsisting among the molluscs of the Tunicata order,—in other words, a species of cuttle-fish, abounding at the bottom of ...
— Mardi: and A Voyage Thither, Vol. II (of 2) • Herman Melville

... higher forms). They all have a cavity within the body (coeloma), and most of them have blood and blood-vessels. In this are comprised the six higher stems of the animal kingdom, the annulata and their descendants, the mollusca, echinoderma, articulata, tunicata, and vertebrata. In all these bilateral organisms the two-sided body is formed out of four secondary germinal layers, of which the inner two construct the wall of the alimentary canal, and the outer two the wall of the body. Between the two pairs of ...
— The Evolution of Man, V.1. • Ernst Haeckel



Copyright © 2024 Free Translator.org